Vulnerability identifier: #VU79466

Vulnerability risk: High

CVSSv3.1: 8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N/E:F/RL:O/RC:C]

CVE-ID: CVE-2023-33242

CWE-ID: CWE-310

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
Gotham city
Server applications / Other server solutions

Vendor: ZenGo X

Description

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to an error in Lindell17 TSS protocol implementation in crypto wallets. A remote attacker can extract the full ECDSA private key by exfiltrating a single bit in every signature attempt (256 in total).

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Gotham city: 0.1.0 - 1.0.0

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External links
http://www.fireblocks.com/blog/lindell17-abort-vulnerability-technical-report/
http://github.com/fireblocks-labs/zengo-lindell17-exploit-poc
http://eprint.iacr.org/2017/552.pdf
http://github.com/fireblocks-labs/mpc-ecdsa-attacks-23

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, a fully functional exploit for this vulnerability is available.